I got asked countless times for LawNaLu, so here it is.

Hope you guys enjoy.

Oda Eiichiro owns One Piece, not me.

A Belated Birthday Treat, Part One!

The Strawhat crew and the Heart Pirates were celebrating in the Aquarium Bar on board the Thousand Sunny.

They had been rewarded with vast amounts of money from King Rikku after he reclaimed his throne in Dressrosa. He admitted that it would never have been possible without the involvement of Luffy and Law. So, he kept enough to rebuild his kingdom, and gave the rest to the pirate captains. Most had belonged to Doflamingo anyway, and he didn't want to use money belonging to that man to return Dressrosa to its former glory.

Nami didn't want to waste a lot of belli on another celebration, not so soon after their banquet on Dressrosa, but she was overruled. There was only sixteen of them, but enough alcohol for thirty, and enough food for fifty. Barrels of rum, and demijohn's of sake filled the lawn deck. Platters of food covered the dinning table in the galley, one sent down to the aquarium bar every few minutes in the dumb-waiter.

Sanji and Jean Bart were frantically running the kitchen. All the other pirates, and the two samurai, were enjoying the party. The ship was noisy with music and laughter. Nami suddenly didn't mind that they had spent a lot belli. It was good to see her friends enjoying themselves, and enjoying life.

Robin sat around the main mast, laughing at Luffy, Chopper and Momonosuke fighting. Kin'emon and Kanjuro were trying to split the trio up, but was only making it worse. Trafalgar Law and Bepo sat on the red bench, towards the back of the room, quietly observing Strawhat's antics. Law didn't look too amused, but he wasn't frowning either. Surely he was used to them now. Franky, Usopp and Brook were huddled together, in cahoots about something.

Shachi and Penguin were on the other side of the tank. They had their faces pressed against the glass, seemingly fascinated by its contents. Their cheeks were tinted pink through the amount of alcohol they had consumed. Their behaviour seemed rather odd considering that they live on a submarine. After observing them for a few minutes, Nami noticed that they weren't looking at the fish in the tank at all. Their eyes were peering through the glass, darting between herself and Robin. The pair often nudging one and other, and laughing like school boys.

Nami picked up her tankard and sat down with Zoro. They clashed their drinking vessels together, and then quickly emptied them with a sigh of satisfaction. Nami refilled both their cups straight away, had a couple of mouthfuls, then got up from her seat to grab some food.

Sanji had set aside a few plates that Luffy was forbidden to touch. Half the food on them was for Nami, he had made her special heart shaped sandwiches. The rest of the food was for Trafalgar Law since he was so adamant about not eating bread. Most of the food he had prepared for the party was sandwiches or meat, and everyone knew they would be lucky to even get a small share of the meat with Captain Carnivore around and his stretchy limbs.

Nami picked up a few sandwiches and sat back down with Zoro.

"Lining your stomach?" Zoro laughed.

Nami shook her in response while chewing on her food.

"What's up Nami, you not challenging me today?" The swordsman asked as he wiped his mouth on the sleeve of his green kimono.

"No, not tonight." She said after swallowing a bite of her sandwich.

"Aren't you the one who is meant to get drunk? We are sort of celebrating your birthday!" Zoro eyed her curiously.

"Maybe." She smiled.

Usopp, Franky and Brook interrupted everyone by jumping up on their seats.

"The last line of this limerick doesn't really fit, but it gives the song the focus we were aiming for." Brook announced, and the trio broke out into a very untraditional birthday song.

"Nami the frightful, oh Nami the brave.

It's not quite your birthday, but let's have a rave! ~

Let's sing lots of songs,

And stay up all night long.

And eat food made by Sanji, your slave.

.

We don't care for your fist, even less for your boot.

You've got a hot temper, and a strange love of fruit.

You're sexy and sassy,

but also quite classy.

Who cares! Get in your birthday suit!"

The final lyric of their song earned Brook a sharp blow to the head. He stood before Nami as if expecting her to strip! Her face was beat red, her fist still clenched, Usopp and Franky cowered in fear. Brook should have expected her to break his bones. If asking to see her panties usually resulted in a physical punishment, then how did he expect she would react to him telling her to get naked?

Sanji and Jean saved him from a further beating as they entered with her birthday cake. It was a large orange chiffon cake, with a light layer of frosting, and mikan segments on top.

"Make a wish!" Luffy urged, as the cake was set down in front of her. Nami looked around at everyone before blowing the candles out. From seeing all their faces in the flickering light of the flames, Nami felt she that didn't need to wish for anything.

Everyone cheered as she cut the cake. Luffy grabbed her shoulders and shook her frantically in excitement. Nami quickly handed the knife back to Sanji before she accidentally stabbed someone with it, and asked him to divide it between everyone.

As the evening crept on, Luffy got more and more boisterous. He'd coaxed Bepo out of being his usually reserved self. It seemed that sticking chopsticks up your nose was a universal ice breaker. Those two, and Chopper, seemed to be having a competition of who could make the stupidest face, with chopsticks up their noses, of course.

It was strange how well the two crews got on. It was as if Shachi and Penguin had always known them. They danced with Franky and Usopp, and sung along to Brooks songs as if they'd heard them a hundred times.

Jean Bart was now bickering with her, Zoro and Sanji over their game of poker. He couldn't grasp how Nami kept winning.

Nico Robin was sat next to Law, and had been for a while. They seemed quite comfortable in each other's company. Their time together being the Caesar Exchange Team had obviously brought them closer.

The three samurai had retired for the evening.

The belated birthday party had run its course. Pirates lay on the floor and benches, asleep and unconscious. A number of them snoring softly.

Robin had decided moments ago that she was going bed. The sound of the door closing had awoken Luffy from his sleep, and he was now rummaging through the remainder of the food.

Nami turned her attention to Trafalgar Law then. The faint shadows under his eyes pointed to why the Surgeon of Death was still wide awake. It appeared that he was used to lack of sleep.

Nami was quite pissed off with him. Everyone had wished her a happy birthday. Everyone, except him. So, decided she was going to make him pay for it. She picked up her tankard of rum and went to join him.

"What were you and Robin talking about all night? This was meant to be a party, but both of you looked so serious!" Nami remarked as she stood in front of him.

"You." Law answered her. His gaze travelled up her body to meet hers.

Nami regarded him suspiciously for a moment.

"You still haven't wished me a happy birthday!" Nami informed their ally, trying to forget his last statement. She wore a frown, and a hand on her hip.

"Have I not?" Law replied. He picked up his drink and had a sip. His golden eyes peering up at Nami through his glass and beneath the rim of his hat. Her sassy pout made him suspect she was up to something, he just wasn't quite sure what just yet.

"You haven't bought me a gift, either." Nami purred as she sat down next to him and pressed herself against him.

"Why would I buy you anything?" Law asked, he turned his head slightly and looked at her through the corner of his eye.

Nami looked him over curiously, then placed her hand on the centre of his thigh and trailed it up to his hip.

Law didn't take his eyes off her. He knew now what she was up to, and he was looking forward to the consequences.

"Fine!" Nami huffed. She slumped back in her seat then, folding her arms across her chest.

The Surgeon of Death chuckled darkly at her actions. The rumours of her being an excellent pick pocket were true. If he wasn't concentrating on the wallet in his pocket, expecting her to take it, then he never would have known it was missing.

He held out his left hand, palm to the ceiling. "Hand it over." He told her confidently.

"Hand what over?" Nami asked, playing ignorant.

"Room"

Nami felt a strange sensation in her chest then. She had felt it before, but through the amount of alcohol she had drunk, she couldn't remember when.

She looked down at the plate of food in front of her. "LAW!" she shouted, and turned to where he was sat. Every one in the aquarium bar was too drunk to be awoken by her angry shout. "Change us back!" She demanded. Nami was horrified by being put in Luffy's body.

The smirk on Law's face only got bigger as he turned to Nami's body that was sat next to him, observing as the captain he had swapped her with was now examining her body. "Luffy, that's a hundred thousand berri you own me!" Nami shrieked in her captains voice, Luffy took no notice of her and cupped her breasts.

Nami got up from the seat around the mast, determined to stop Luffy's before she had to charge him any more for touching her body.

His body felt strange, Nami didn't know if it was because of his devil fruit or the amount of alcohol he had drank, but it certainly seemed more difficult to move.

"Stop it, Luffy!" Nami demanded. Her captain ignored her plea, so she pulled his hands from her body. It was embarrassing to see the aroused expression on her own face. Luffy clearly enjoyed touching himself in her body.

"Change us back. Now!" She fumed. Nami's face resembling the determined expression Luffy always had in the heat of battle.

"This is your present." Law laughed. He turned to watch Luffy again as he started exploring Nami's body for a second time.

Nami did the only thing she thought might force him to change them back. She climbed on Law's lap, straddling him, then turned his face to her and quickly kissed him.

Nami wasn't opposed to kissing Law, especially while she was in Luffy's body, but she imagined he would be. She smiled triumphantly to herself, knowing that she had won this round and expected to be put back in her own body any second. She was just about to break the seal of their lips when Law returned her kiss, much to her surprise.

She pushed him away in disbelief. There was confidence and fearlessness in Law's eyes. His hands gripped Luffy's buttocks and pulled his body further on to his lap. Nami couldn't believe what was happening. She tried to get Luffy's attention but he was to preoccupied with being in her body to notice what was happening to his own.

Law leant forward and kissed her passionately. Hot flashes of his tongue ignited her senses. Nami was suddenly aware of how a man's arousal felt as the shorts Luffy was wearing became very constricting.

She pulled away from their kiss, scrambled off Law's lap, and fell to the floor. Law rubbed the sole of his shoe against her crotch. He wanted to make sure she knew he was aware of how aroused she was from their kiss. There was no way she could hide it being in Luffy's body.

Law stared down at her, the victorious smirk tugging at the corners of his mouth utterly pissed her off. Before she could get up to hit him Law swapped her position with an empty tankard at the far side of the room.

He turned his attention to Luffy again, who was thoroughly enjoying exploring Nami body. Luffy's hands were still on her breasts, but when Law moved to grab one, Luffy unzipped her shorts.

Law turned to look up at Nami then, who angry at still being in Luffy's body. He enjoyed the angry expression on Luffy's face as she watched Law give her breast a gentle squeeze. She was running almost comically towards them in her captains body. Law transported her again to the other side of the room again.

When Law looked back, Luffy's hand was down her shorts, her cheeks pink from more than just the alcohol.

Law scooped up the legs of Nami's body and brought them over his knees. The man in her body stared up at him then quizzically. Law was ruining his fun.

Law leant in closer, he could hear the actual woman in Luffy's body shout something to them, but he ignored it.

"Tora-o, what are you doing?" The man from within Nami asked.

"Shh!" He said as he continued to close the distance between them.

Law quickly generated his room and switched them back. His lips immediately slammed into Nami's. She instinctively kissed him back, finally able to properly enjoy his touch, but Nami quickly came to her senses and removed her hand from her shorts to push him away. Law grabbed her wrist and sucked her fingers while he stared down at her. His other hand was lightly trailing up her leg, causing a shiver to run through her body.

She turned to look at Luffy then, he was rubbing his own hardened length through his jeans. "You both own me for this!" Nami burst out in embarrassment. She wasn't sure if she should have enjoyed that kiss, or if he was just teasing her for his own sadistic amusement.

She got up from beneath Law and exited the Aquarium Bar. She certainly wasn't tired, so she made her was to the library to cool down, and clear her head.

Luffy watched her leave. His usual childish, dumb struck expression not visible on his face.

Law transported himself to the crow's nest before Nami even left the room. He watched as she entered the library and slowly turned the lights on before sitting at her desk.

He wasn't finished with her yet.

So, this was totally more LawNa than anything else. But it was also a bit LawLu (even if it was Nami in Luffy's body.)

This chapter was a bit more playful and light for anyone who wanted a bit more of a fluff filled fic, the next chapter will be a total lemon!

I hope people enjoyed this anyway, and that the Nami/Luffy switch came across okay …

Please review, I'd really like some feedback on this :) Thanks